Library

 is a Spire upgrade in Tyranny.

Background
Constructing a Library on a Spire allows you to research magical knowledge, Edicts, and Artifacts. Once built, resting in any Spire grants a bonus to Lore and all Magic skills. It's a good idea to construct the library first, as it will allow the most time to conduct research and will greatly increase the functionality of your other upgrades once you acquire them.

Features

 * Sage Garus arrives at your library to manage your efforts, and provides a convenient interface for researching items. Research proceeds as your party gains experience and requires scrolls and Spire recruits to begin.
 * You can recruit master trainers to train your magic skills; without Library trainers, only one recruit each at the Mountain Spire and the Training grounds can train you in a limited number of magic skills.
 * Note that increasing skill points via training is limited per character level; once you have reached the limit for the current character level, the character has to reach the next level before you can further increase skill points by training. This means that you have to choose between improving your stronger skills for more character experience to gain a level, or brushing up on your weaker skills.
 * With New Game+, you can build the Library just before resolving The Armies in the North, allowing you to save maintenance and still improve the Fatebinder for the next playthrough.

Research

 * Research is conducted as time passes, started when you gain experience. To maximize the library's output, travel back to it and check on Garus every time you complete a quest or location.
 * Researching artifacts requires at least 8 scrolls and four recruits at the library.
 * You can research Hierarch's Robes from the get-go.
 * Deathbringer after Visiting the Burned library and picking up a obsidian fragment.
 * Snowfang and Scales of Mercy require The Silent Archive.
 * Researching items requires and 2 recruits. Further research increases the cost by 1 each.
 * You can research Azurebell, Marshberry, Skycap, and Sableroot from the get-go.
 * Researching weapon plans requires, the appropriate plan book, and 5 recruits.
 * Zeal, The Baneward, Heart's Blood, can be researched that way..
 * Researching drug recipes requires, the recipe, and 3 recruits.
 * With The Silent Archive, you can additionally research Potion of Heroes, Oldwater, and Dire Remedy.
 * Researching sigils requires, the appropriate recipe, and 3 recruits.

Recruits

 * Phila: A skill trainer who teaches Lore, Control Fire, Control Frost, and Control Lightning.
 * Eirena: A merchant with a collection of rare magical scrolls.
 * Velos: A scribe and loreseeker who regularly provides Scrolls to further Research. Recommended recruit.
 * Lithos: A skill trainer who teaches Control Stone, Control Atrophy, and Control Force.
 * Erastus: A master trainer who teaches Control Stone, Control Force, and use of the Magic Staff.
 * Noxia: A skill trainer who teaches Subterfuge and use of the Magic Staff.
 * Puppet: A master trainer who teaches Control Fire and Control Emotions.
 * Sage Nerea: [Conquest] A master trainer who teaches Control Gravelight and Control Illusions.